From a global perspective, dense gas tracers such as \(L_{\rm HCO^+}\)  or
\(L_{\rm HCN}\)  and SFR tracers such as \(L_{\rm IR}\)  or \(L_{\rm H_{\alpha }}\)  are believed to correlate well with each other in
log-log space ([1]}, [2]}, [3]}). The relations,
however, are not identical for different transitions nor for different
dense gas tracers ([4]}, [5]}, [6]}). Moreover,
intrinsic variation in this relationship suggests that simple correlations are inadequate for capturing the full range of star
formation behavior ([7]}).
